COMPRESSIVE STRENGTH AND SULFATE RESISTANCE OF SELF-COMPACTING CONCRETE INCORPORATING AS-RECEIVED RICE HUSK ASH AND LIMESTONE POWDER

Abstract

In this study, compressive strength and sulfate resistance of self-compacting concrete (SCC) incorporating as-received rice husk ash (RHA) and/or limestone powder (LS) in various replacement levels were investigated. For parametric study, RHA and/or LS were used as a type 1 Portland cement (OPC) replacement material at 0%, 20% and 40% by weight of binder (OPC+RHA+LS). The mixtures were designed based on controlled slump flow in the range of 70 ± 2.5 cm. Flow values and compressive strength of the SCC mixtures were examined. In addition, sulfate resistance of SCC was determined in a 5% sodium sulfate (Na₂SO₄) or a 5% magnesium sulfate (MgSO₄) concentration at 1, 7, 28, 90 and 180 days. Results indicated that when increasing percentage replacement of RHA, the expansion and compressive strength loss of SCC increased. However it can be improved by adding LS in the SCC mixtures.